How to use it
- Enter the values you know.
- Adjust units, rates or dates to match your situation.
- Read the result instantly and try another scenario if needed.
Dates & time
Date & Duration
Find the exact time between two dates.
—Duration00 weeks · 0 days
✓ Your data stays on your device✓ Free · no sign-up✓ Runs locally
Method
The result is recalculated immediately from the displayed inputs and the stated mathematical relationship.
Worked example
Find the exact time between two dates.
Reference: nist.gov · Last reviewed: 2026-07-23
Supported formats
Numbers, dates and browser-based results
Private by design
Your data stays on your device. No account is required.
Frequently asked questions
Does this calculator store my values — Date & Duration?
No. The calculation happens in your browser and the values are not saved or sent to our server.
Is the result exact — Date & Duration?
The result follows the displayed formula and your inputs. Financial, health and time-zone results are estimates and should be checked for important decisions.
Can I use it without an account — Date & Duration?
Yes. The calculator is free and works without signing in.